Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f671299c4fa4eb…

MALICIOUS

PDF

90.4 KB Created: 2021-08-30 16:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e0c503420d6b2495562e62e690fbf740 SHA-1: 45115cba62576f9b9a9b5b6ca4dca07c545fc18a SHA-256: e7f671299c4fa4eb1d5777bfbb5e34768c006fc84a65373cf0372b8c8b718c13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to lead users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://coretry.ru/uplcv?utm_term=list+of+continents+in+the+world PDF link annotation
    • https://capitalsyndic.com/userfiles/file/likagibetasakuluketupadeg.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/54118095231.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/maduxozenasuz.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/67790241268.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/44414969415.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/13183431348.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/64baa5dfbc41a530ae945127c8b6f9d8/pujozuzuwinumupageji.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/0e0fbcd67001e4bf2b87c546ca343284/36170724053.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/22260088382.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8816c18279---kupetuvinepigipiwuni.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/momodufikipuliduf.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210817043037436.pdfIn PDF document text
    • http://wohntraumgmbh.at/28956207856.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/59404407956.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160876d5cdaa82---3021653269.pdfIn PDF document text
    • https://highrise.pl/file/10854134018.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/0m105tap8q79kf82te687jt1v2/vagowowovigof.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/77230899225.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160792735ed489---31121169149.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b94078e4639---57220284222.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/2k0p52bn655klphgbrva9r7ffl/81142808714.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/lojujutipizunuzarel.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079840860dfe---zideguveserorutufagunerul.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/gorudozulixefosas.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E6 19408 bytes
SHA-256: 09f05add398804d23a547934ee77017bf02b5fd4332c472930f69daaedee9a3b
font_01_sfnt_off00012b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B95 10456 bytes
SHA-256: ec3e67b1b606573ea82ece30f05ffccd396c4d8a09565bed4665cbf9842afea6
font_02_sfnt_off0001434f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1434F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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